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Eight wires cut the page perpendicularly...

Eight wires cut the page perpendicularly at the points shown. Each wire carries current `i_0`. Odd currents are out of the page and even currents into the page. Find the line intergal `oint vec B.vec(dl)` along the loop.

Text Solution

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Acoording to ampere.s circuital law
`oint vec(B). vec(dl) = mu_0 i ` enclosed
`oint vec(B).vec(dl) = mu_0[i_0 - i_0 + i_0 + i_0]`
`oint vec(B).vec(dl) = 2mu_0i_0`
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